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JEE Main levelSingle correct optionDifficulty 2 of 3o2183

Hex-1-yne is treated with disiamylborane and then with . The major product is

  1. Ahexanal
  2. Bhexan-2-ol
  3. Chexan-2-one
  4. Dhexan-1-ol

Answer: A

Boron adds to the terminal carbon of the alkyne, giving a vinylborane. Oxidation gives the enol , which tautomerises to the aldehyde hexanal.
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